Installation Manual

Installing S25N and S25V Systems 33
Installing the Redundant DC Power Supply for the S25V
The Redundant Power Supply Unit (PSU) for the S25V is a 470W AC/DC rectifier. It includes
rack-mounting hardware, an AC cable, and a cable to connect to the DC power leads on the S25V. The
power supply is oversized to support the Power over Internet (PoE) feature, too large to install in the S50
External Power Shelf (EPS). Instead, to install the PSU in a rack, complete the steps below for a single
unit. For a tandem installation, see Inserting Tandem PSUs into a Rack on page 34.
Step Task
1.
Using a #2 Phillips screwdriver, attach the short sides of the rack ears to the front corners of the
power supply with the supplied screws.
Figure 17 Attaching Rack Ears to PSU
2.
Insert the PSU into the rack and brace it temporarily in the rack so that the screw holes in the long
sides of the rack ears are flush and align with the screw holes in the rack posts.
3.
Secure the PSU on the left and right sides by tightening the supplied screws through the flanges to
the side of the rack, as shown in Figure 18. (Cage nuts are also supplied for racks that have mounting
holes without threads.)
Figure 18 Mounting Single PSU in Rack